Hard seal is the sealing between metal and metal, metal sealing ball and seat are. The machining accuracy and process is difficult, generally used in high pressure, often more than 35 mpa. Soft seal is sealed between the metal and nonmetal, such as nylon tetrafluoroethylene, manufacturing standards are the same. An elastic soft-sealing gate Industrial Valves, sealing material and hard seal gate valves are for the seat of the sealing material, hard seal is to use the seat material precision machining, and the valve core ( A sphere) The matching accuracy, generally speaking, there are stainless steel and copper. Soft seal is set in the seat sealing material for non-metallic materials, because of the soft sealing material has certain elasticity, therefore hard seal will be relatively low demands on machining accuracy. Second, because of many chemical manufacturing process, mechanical industry working environment is more complex, many of them are high temperature and high pressure, the medium of frictional resistance is big, strong corrosion, now technological progress, all kinds of materials used is better, can keep up with all the aspects of processing, make hard seal ball valve has been widely promoted. Actually hard seal principle and soft sealing gate valve is the same, just because is sealed between the metal, to consider the relationship between the hardness of metal, as well as the working condition, what medium, etc. Are generally required to do hardening treatment, between the ball and seat to grinding to the seal. Hard seal gate valve production cycle is long, processing is more complex, hard seal ball valve is not easy to do. Three, use condition on soft seal generally seal can achieve very high, while hard seal according to the requirements can be high to low; Soft seal need to fire prevention, because at high temperatures, soft sealing material will leak, and hard seal is not the problem; Hard seal generally can do high pressure, soft seal is not; Soft seal due to the problem of flow medium, some occasions is can't use, Some corrosive medium, for example) ; The last hard seal generally more expensive than soft sealing valve. In manufacturing, both difference is not big, is the seat of the main difference, non-metallic, soft seal is is metal hard seal. Four, on the equipment type selection MianRuan, hard seal gate valve is chosen mainly according to the process of medium, temperature and pressure, the general medium containing solid particles or with wear or temperature higher than 200 degrees had better choose hard seal, diameter greater than 50 valve pressure difference is bigger also considered open valve torque size, large torque should choose fixed hard seal gate valves, both hard and soft seal their level of sealing can reach level 6.
Collectively, the effect of wedge gate valve on industrial society has been to eliminate os gate valve and drastically reduce the time long associated with y gate valve.
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When you choose to buy instead of os & y valve fire protection, the money you save may allow you to buy multiple other necessities, more than you had initially planned on buying.
need fuel for energy,while os&y gate valve do not.